CN104497730A - Water-borne crack lacquer, preparation method and application method thereof - Google Patents

Abstract

The invention discloses a water-borne crack lacquer. The water-borne crack lacquer comprises a primer which is first elastic emulsion, and a finish paint which comprises second elastic emulsion of which the toughness is less than that of the first elastic emulsion; the first elastic emulsion is a modified styrene-acrylic emulsion, silicone acrylic emulsion, vinyl acetate-acrylic emulsion or fluoride varnish; the second elastic emulsion is acrylic emulsion, acrylic ester, vinyl acetate-acrylate copolymer, epoxy resin emulsion, pure acrylic or silicone acrylic emulsion; the finish paint can be coated after surface of the primer is dried, and the flexibility can be kept for more than 48 hours, so that the construction time is greatly prolonged, and the cracks cannot be changed over time; the generated cracks are uniform, and thus the invisibility effect can be effectively improved.

Description

Water-based strain indicating lacquer, its preparation method and method of application

Technical field

The present invention relates to technical field of coatings, particularly relate to a kind of water-based strain indicating lacquer, its preparation method and method of application.

Background technology

Traditional strain indicating lacquer is by the nitro crack paint of the formed shades of colour of the grinding modulation such as nitro-cotton, pigment, pigment extender, organic solvent, auxiliary, also just so strain indicating lacquer also has some fundamental characteristics of pyroxylin(e)finish, belong to volatility air-drying varnish, need not add solidifying agent, rate of drying is fast.Therefore strain indicating lacquer must could merge completely on one or more layers pyroxylin(e)finish surface of same characteristic and represent another crackle characteristic of strain indicating lacquer.Because strain indicating lacquer mealiness content is high, the volatility of solvent is large, and thus its shrinkability is large, and snappiness is little, and what after spraying, internal stress generation was higher pulls intensity, forms good, uniform crack pattern.

Current domestic woodwork coating uses strain indicating lacquer to be mainly oiliness for master, the VOC of generation is very huge to environmental influence, and need to use the color stuffings such as a large amount of flatting silicas just can reach the effect of crackle in formula, this traditional solvent-borne type strain indicating lacquer is not only crisp, and sticking power is also bad.

Chinese patent 201310081512.0 discloses a kind of water-based strain indicating lacquer, and comprise water-based crackle priming paint and water-based crackle finish paint, water-based crackle priming paint comprises aliphatic polyurethane dispersion emulsion I, defoamer, ground wetting agent, thickening material and water; Water-based crack surface enamel-cover draws together aliphatic polyurethane dispersion emulsion II, high TG acrylic resin, defoamer, ground wetting agent, thickening material, white slurry and water.But urethane toxicity is large, discontented toe ring guaranteed request, and also it is responsible to there is component, and application conditions requires harshness etc.

Chinese patent 201410009189.0 provides a kind of water-based strain indicating lacquer, and it coats water-based wire drawing primer layer, and comprises the constituent of following weight percent: the waterborne self-crosslinkable emulsion of 53-91wt%; The film coalescence aid of 0-5.5wt%; And the deionized water of 5-47wt%, the part by weight of this film coalescence aid and this waterborne self-crosslinkable emulsion need be less than or equal to 0.065.But its with apply bottom surface and have strict demand, limit its versatility, and what produce is withered tree line, needs segmentation crack to be main occasion, can not satisfy the demands for some.

So just need one to apply facility, environmental protection and the water-based strain indicating lacquer that can produce based on segmentation crack.

Summary of the invention

The object of the invention is the technological deficiency for existing in prior art, and provide one to apply facility, environmental protection and water-based strain indicating lacquer, its preparation method and the method for application that can produce based on segmentation crack.

The technical scheme adopted for realizing object of the present invention is:

A kind of water-based strain indicating lacquer, comprise priming paint and finish paint, described priming paint is the first elastic emulsion, finish paint comprises the second elastic emulsion that toughness is less than the first described elastic emulsion, the first described elastic emulsion is modifying cinepazid emulsion, organosilicon crylic acid latex, acrylate and vinyl acetate emulsion or fluoro-containing coating, and the second described elastic emulsion is ACRYLIC EMULSION, acrylate, vinyl acetate between to for plastic-acrylic acid esters co-polymer, epoxy emulsion, pure third or organosilicon crylic acid latex.

Also comprise according to the mass fraction in described finish paint,

Aqueous color paste 8-20%;

Deionized water 20-30%.

Described priming paint also comprises deionized water or aqueous color paste 1-20% by mass percentage, defoamer 0.1-1.2%, to improve film-formation result.

Described finish paint also comprises auxiliary agent A MP-950.1-2% according to the mass fraction; Propylene glycol 0.1-2%, thickening material 0.5-1.2%.

Also comprise the nanoscale ferrite magnetic that mass percent counts 0.1-2%.

Described finish paint also comprises defoamer 1-3 mass fraction to prevent from bubbling during mix and blend, also makes crackle more intensive simultaneously.

A preparation method for water-based strain indicating lacquer, comprises the following steps:

1) priming paint preparation: add water and thickening material in the first elastic emulsion, to make priming paint keep good alkali resistance and water tolerance,

2) finish paint preparation: after the second elastic emulsion and aqueous color paste mix in proportion under 400r/s, period, micromicro added multifunctional assistant AMP-95 auxiliary agent and propylene glycol again as prevented, then adding defoamer as stirred foaming, adding defoamer and can produce more intensive crackle simultaneously.

A method of application for water-based strain indicating lacquer, comprises the following steps,

1) at the even primer coating of body surface to be applied, base coat thickness is greater than 8 μm;

2) until priming paint surface drying or absolutely dry after, evenly apply finish paint, finish paint coating thickness should be greater than 5 μm;

3) crackle can be formed in finish paint air drying process.

Wherein, crackle produces Physical Mechanism, and mainly priming paint is different with the coefficient of surface tension of finish paint, and in air drying process, stretching distance is different, for a certain priming paint border, this priming paint produces a section and moves, and adds the displacement of finish paint at this boundary contraction, as long as this displacement exceedes capillary distance

$L_C=\sqrt{\frac{\mathrm{\Δ\σ}}{\mathrm{\ρg}}}$

Wherein Δ σ: the end, finish paint coefficient of surface tension are poor

ρ: density

Compared with prior art, the invention has the beneficial effects as follows:

Priming paint only needs surface drying to apply finish paint, and obtaining snappiness can keep more than 48h, and the engineering time extends greatly, and crackle can not time to time change, and the crackle of generation is even, can effectively improve stealthy effect.

Accompanying drawing explanation

Figure 1 shows that crackle camouflage color schematic diagram;

Figure 2 shows that the crack pattern of the generation of strain indicating lacquer on concrete slab

The colored strain indicating lacquer photo of Fig. 3-5.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

First embodiment

When military emergent field uses, benzene emulsion selected by priming paint, finish paint ACRYLIC EMULSION, priming paint coating thickness is greater than 8 μm, but being directly coated with time within 10um without the need to processing substrate surface, within after primer coating ten minutes, applying finish paint after surface drying, after coating finish paint, about 20 to three ten minutes of time of drying can form polygon crackle, the camouflage of military vehicle or equipment can be completed in 30 minutes, and use corresponding epoxy emulsion and solubilized to wash away.

Benzene emulsion and ACRYLIC EMULSION with the use of, ensure to produce straight line, can there is diffuse-reflectance in electromagnetic front illuminated on strain indicating lacquer simultaneously, makes to be coated with the object type of strain indicating lacquer like lambert's body, and its RCS (Radar Cross Section) will be less than the object of applying smooth paint.Meanwhile, benzene emulsion has receptivity to hertzian wave and light, and the radar of absorbing wavelength in microwave range or sonar ripple, the stealthy effect of radar can be improved.This experiment wave source of 30um wavelength irradiates the tinplate thin plate of the thick strain indicating lacquer of coating 20um, and data are as shown in table 1 below.

Table 1

Sheet material type	The strong uv of reflection wave
		Tinplate	120
Strain indicating lacquer	95
		Common paint	120

Second embodiment

In case of emergency directly can be coated with transparent crack paint on camouflage color military vehicle or weaponry, the words of generalized case directly can prepare colourless or deep green priming paint, select high light benzene emulsion, certainly also can acrylate and vinyl acetate emulsion or pure-acrylic emulsion, the deionized water of mixing 10%, and add the thickening material of 5%.

Finish paint adopts three kinds of color finish paints of camouflage color three look, and select ACRYLIC EMULSION, certainly also can select epoxy emulsion, the mill base of required color adds 20%, Homogeneous phase mixing under 400r/s dispersion machine, and mill base directly can buy pigment company finished product, also can prepare voluntarily,

But finish paint pvc (pigment volume concentration (PVC)) is higher, and the crackle that will cause is more intensive, and in experiment test finish paint, water-based paint accounts within the scope of 8-20% and can form crackle.Then crackle camouflage color paint can be obtained in finish paint drying process according to existing digital camouflage spraying technology even application.As shown in Figure 1.

This crackle camouflage color paint imitates the crackle that vein effect camouflage color strain indicating lacquer imitates vein shape, and cost is low, can substitute traditional camouflage color paint on a large scale to obtain better camouflage effectiveness, compensate for existing stealthy paint that cost is high cannot the defect of application on a large scale.

3rd embodiment

Crackle camouflage color stealth paint can when radar wave irradiates diffuse-reflectance mechanism, its profile can play recessive role to a certain extent to millimeter wave band radar, when the stealthy effect of needs, use in crackle camouflage color paint priming paint styrene-acrylic resin emulsion admixture massfraction 2% nanoscale ferrite magnetic to weaken with magnetic loss principle and return radar wave, and control base coat thickness and at utmost to interfere with zero incident, reflection wave close to enemy's radar wavelength at 8-80 μm as far as possible and disappear mutually.

Finish paint adopt benzene emulsion and ACRYLIC EMULSION mass ratio 1:1 with the use of, wherein, add thickening material 0.5% again, multifunctional assistant AMP-951%, propylene glycol 1%, deionized water 15%, ensure to produce straight line, can there is diffuse-reflectance in electromagnetic front illuminated on strain indicating lacquer simultaneously, makes to be coated with the object type of strain indicating lacquer like lambert's body, and its RCS (Radar Cross Section) will be less than the object of applying smooth paint.Meanwhile, benzene emulsion has receptivity to hertzian wave and light, and the radar of absorbing wavelength in microwave range or sonar ripple, the stealthy effect of radar can be improved.This experiment wave source of 30um wavelength irradiates the tinplate thin plate of the thick strain indicating lacquer of coating 20um, and data are as shown in table 2 below.

Table 2

Camouflage color strain indicating lacquer imitates the crackle of vein shape, cost is low, traditional camouflage color paint can be substituted on a large scale to obtain better camouflage effectiveness, compensate for that existing stealth paint cost is high cannot the defect of application on a large scale, and the stealthy ability more than 20% strengthening existing invisible coating can make in logistics transportation and more not easily being found by enemy by crack pattern.

4th embodiment

When civilian as house fitting-up novelty finish time, all material all adopts water-based, low voc starting material, and priming paint uses polyacrylic ester, ensures the good water-alkali resistance of priming paint and toughness, can mix the aqueous color paste of 0-10% as required.Finish paint uses pure acrylic latex to have good freeze-thaw stability, calcium ion stabiliser, add: thickening material TT-9361.2%, multifunctional assistant AMP-951.6%, propylene glycol 2%, deionized water 10%, aqueous color paste 20 parts, at 400r/s dispersion machine Homogeneous phase mixing, i.e. obtained assorted strain indicating lacquer, the color in can freely arrange in pairs or groups crackle gap and be full of cracks face.

Priming paint finish paint all can produce rear long-time storage on a large scale, and it is short to have stopped the priming paint quality guaranteed period in former water-based strain indicating lacquer patent, shortcoming that even can only be now with the current.

Coating process:

1) at the even primer coating of body surface to be applied, base coat thickness is greater than 8 μm and is less than 80 μm;

2) until priming paint surface drying or absolutely dry after, evenly apply finish paint, finish paint coating thickness should be greater than 5 μm and be less than 80 μm, and can thicken finish paint according to the increase of required crack width.

3) crackle can be formed in finish paint air drying process.

Coating will ensure evenly as far as possible, crackle can determine its form produced with stressing conditions difference, as even spread is then each to the even segmentation crack of stressed identical generation, as the fade effect needing certain direction intensive, finish paint thickness can be increased in that side gradually or increase spraying flow velocity or increase brushing dynamics.

Material major part used herein is that the polyacrylic ester that toxicity is low overcomes forefathers' water-based strain indicating lacquer coating process trouble, raw material environment protecting not very advantage, the mechanism cracked strain indicating lacquer has theoretically had breakthrough, solve water-based strain indicating lacquer complex production process, coating process bothers and is not easy to produce the shortcoming of ideal crack, is a water-based strain indicating lacquer with application of can producing on a large scale.

Priming paint has good sticking power and mechanical property, also can adopt acrylate and vinyl acetate emulsion, organosilicon crylic acid latex, high light benzene emulsion etc.Finish paint also can select fluoro-containing coating, silicon-acrylic coatings and styrene-acrylic coating according to the requirement of the pattern of crackle.Crackle finish paint can refer to touch construction in dry 5 hours at priming paint.The crack spacing size of crack pattern and the bifurcated type of crackle can control.Detect the over-all properties of coating in test, such as mechanical property, sticking power, water-fast, scrubbing resistance, detected result shows that this coating property is excellent, as shown in table 3 in concrete surface spraying data.Fig. 2 is the pattern of strain indicating lacquer of the white finish paint on concrete slab of preparation, and Fig. 3-5 is preparation to enamel strain indicating lacquer photo at concrete slab.

Table 3

Test item	Detected result
		Crack pattern	There is satisfied crack effect
Toughness	1mm
		Water tolerance	48h film is without destruction
Alkali resistance	48h film is without destruction
		Scrub resistance	2000 times without show-through

5th embodiment

Use at civilian house fitting-up novelty finish, as needs obtain different in width crackle, then can control priming paint and select and be coated with the large benzene emulsion of film toughness and coordinate pure acrylic latex finish paint that toughness is little to obtain wider crackle, specific configuration method is as example four.

As in use needed finer and closely woven crackle, polyacrylic ester selected by priming paint, finish paint is prepared according in example four, then can with addition of reducing capillary reagent as improved the massfraction of defoamer, the different strain indicating lacquer of the fine and closely woven degree of crackle is obtained by the massfraction increasing defoamer, as maximum as crackle in defoamer massfraction 0%, 0.25% as the medium class of crackle, and 0.5% as the finest and closely woven class of crackle.

6th embodiment

When smallclothes coatings such as mouses, priming paint adopts acrylate and vinyl acetate emulsion and massfraction 5% deionized water 400r/s to mix.

Finish paint adopts pure-acrylic emulsion according to proportioning in example four, increases multifunctional assistant amp-95 massfraction to 2%, the edge peeling cracking be coated with to prevent smallclothes.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. a water-based strain indicating lacquer, it is characterized in that, comprise priming paint and finish paint, described priming paint is the first elastic emulsion, finish paint comprises the second elastic emulsion that toughness is less than the first described elastic emulsion, the first described elastic emulsion is modifying cinepazid emulsion, organosilicon crylic acid latex, acrylate and vinyl acetate emulsion or fluoro-containing coating, and the second described elastic emulsion is ACRYLIC EMULSION, acrylate, vinyl acetate between to for plastic-acrylic acid esters co-polymer, epoxy emulsion, pure third or organosilicon crylic acid latex.

2. water-based strain indicating lacquer as claimed in claim 1, is characterized in that, also comprise according to the mass fraction in described finish paint,

Aqueous color paste 8-20%;

Deionized water 20-30%.

3. water-based strain indicating lacquer as claimed in claim 2, it is characterized in that, described priming paint also comprises deionized water or aqueous color paste 1-20% by mass percentage, defoamer 0.1-1.2%, to improve film-formation result.

4. water-based strain indicating lacquer as claimed in claim 2, it is characterized in that, described finish paint also comprises auxiliary agent A MP-950.1-2% according to the mass fraction; Propylene glycol 0.1-2%, thickening material 0.5-1.2%.

5. water-based strain indicating lacquer as claimed in claim 2, is characterized in that, also comprise the nanoscale ferrite magnetic that mass percent counts 0.1-2%.

6. water-based strain indicating lacquer as claimed in claim 1, it is characterized in that, described finish paint also comprises defoamer 1-3 mass fraction to prevent from bubbling during mix and blend, also makes crackle more intensive simultaneously.

7. a preparation method for the water-based strain indicating lacquer as described in any one of claim 1-6, is characterized in that, comprise the following steps:

1) priming paint preparation: add water and thickening material in the first elastic emulsion, to make priming paint keep good alkali resistance and water tolerance,

2) finish paint preparation: after the second elastic emulsion and aqueous color paste mix in proportion under 400r/s, period, micromicro added multifunctional assistant AMP-95 auxiliary agent and propylene glycol again as prevented, then adding defoamer as stirred foaming, adding defoamer and can produce more intensive crackle simultaneously.

8. a method of application for the water-based strain indicating lacquer as described in any one of claim 1-6, is characterized in that, comprise the following steps,

1) at the even primer coating of body surface to be applied, base coat thickness is greater than 8 μm;

2) until priming paint surface drying or absolutely dry after, evenly apply finish paint, finish paint coating thickness should be greater than 5 μm;

3) crackle can be formed in finish paint air drying process.